The intrinsic colour of M0 giants in the Solar neighborhood is
\((J-K)_o\) =0.97 [1]}, [2]}, so we first
apply a colour selection of \((J-K_s)\)\(\ge \) 0.90 to GALAH targets to both
account for the natural spread with the breadth of the M0 spectral type and
the slight difference in wavelength-baseline between the Johnson's \((J-K)\) 
and 2MASS \((J-K_s)\)  indices.
